Bell Traverse is definitely a pass, I don’t think anyone disputes that. I have done the full route twice and most of it (just missing the bit between Twins Cave and the escarpment) 3 other times. Incidentally my first time doing it was as a day hike with Cockade Pass. The other time I did the full route was as a day hike looked with Xeni Pass - so I have looped it with some of my favourites. I also used it to get to Twins Cave to climb Mitre and the two Horns. It is a cool route - but my biggest reason why BT doesn’t make my list of 5* passes is that some of the best views in the Drakensberg are the views of the Cathedral Ridge, and on BT you don’t really get that as you are too close to it. By contrast, Ntonjelana Pass has some exceptional views of that ridge.
Fangs Pass is an interesting one - I did it back in 2014 and haven’t done it again. I recently did Madonna Pass, which I actually thought was a better pass (story at https://jonathantheghaznavid.wordpress.com/2020/02/02/mbundini-abbey-spire-in-a-day/). What Madonna Pass has that Fangs doesn’t is the Mbundini Abbey straight above you - which was really cool! I enjoy being directly below massive cliffs. Incidentally, Mbundini Pass is one of the passes on my do-not-repeat list.
Admittedly - when it comes to evaluating the best passes, after the real standout ones, there is just a mass of really awesome passes that I wouldn’t try to rank. For agument sake, the 4* passes. Giants, Judge, Mnweni, Rockeries, Ntonjelana, Buttress, Bollard, Mzimude, North Hlathimba, Elandshoek and probably about 20 more.
1* passes will be reserved for South Saddle Pass - I would give it 0* if the view wasn’t so good. If gully wasn’t so overgrown, it would be a top quality pass, but covering that much ground in thick vegetation is really not pleasant.
2* would be reserved for the Central and South Jarding Passes. Really nothing of interest on them. Fairly easy, but not as easy as Langalibalele nearby. Not much of a view, overgrown approach, loose ground. Just generally not worth doing.